How does RSTP implement P/A fast convergence

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RSTP implements fast convergence by improving the STP protocol.

The link is point-to-point, and RSTP changes to the forwarding state based on the P/A fast convergence:
The upstream device sends the Proposal packet and starts the waiting timer.
The downstream device blocks all other ports and sends back the Agreement packet to the upstream device.
The upstream device receives the Agreement packet and the port enters the forwarding state.
The preceding process is repeated between all upstream devices and downstream devices, implementing the fast convergence on the entire RSTP network.
NOTE:
The P/A fast convergence cannot be implemented for non-point-to-point links.
If a Huawei device is connected to a device from other manufacturers, run the stp no-agreement check command to implement fast convergence.

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